Hydraulic jack device

Abstract

A hydraulic jack device has a pump, a handle, a hydraulic cylinder, a rocking arm, and a lifting seat. A hydraulic shaft is inserted through the hydraulic cylinder and connected to the rocking arm. The rocking arm is connected to the lifting seat. The pump has a main body connected to the hydraulic cylinder, a chamber formed in the main body, a piston cylinder, a piston, and a C-shaped ring. The driven rod has a round end and a hollow box end. The driven rod passes through the piston cylinder, a coiled spring, and the piston. The round end of the driven rod is inserted in the chamber. A first and a second oil channels are formed in the hydraulic cylinder.

I claim:  
     
       1. A hydraulic jack device comprises: 
       a pump, a handle, a hydraulic cylinder, a rocking arm, and a lifting seat,  
       a hydraulic shaft inserted through the hydraulic cylinder and connected to the rocking arm,  
       the rocking arm connected to the lifting seat,  
       the pump having a main body connected to the hydraulic cylinder, a chamber formed in the main body, a protruded block disposed on the main body, a piston cylinder disposed on a top portion of the main body, a piston disposed between the main body and the piston cylinder, and a C-shaped ring disposed on a top portion of the chamber to fasten a driven rod,  
       the driven rod having a round end and a hollow box end,  
       the piston cylinder having a hexagonal hole receiving a coiled spring,  
       the piston having a round hole,  
       the driven rod passing through the hexagonal hole of the piston cylinder, the coiled spring, and the round hole of the piston,  
       the round end of the driven rod inserted in the chamber,  
       a first oil channel formed in the hydraulic cylinder to communicate with the chamber,  
       a second oil channel formed in the hydraulic cylinder to communicate with the piston cylinder, and  
       the handle having a connection end engaging with the protruded block.  
     
     
       2. The hydraulic jack device as claimed in claim  1 , wherein the protruded block has a circular hole. 
     
     
       3. The hydraulic jack device as claimed in claim  2 , wherein the connection end of the handle has a first through hole and a second through hole, a first pin fastens the protruded block and the connection end of the handle together via the first through hole of the connection end and the circular hole of the protruded block, and a second pin fastens the hollow box end of the driven rod and the connection end of the handle together via the second through hole of the connection end of the handle.